Abstract

A modified Coherent 899–21 titanium sapphire laser is injection locked to produce 6–6.5W of single-frequency light at 852 nm. After closed-loop amplitude control and frequency stabilization to a high-finesse cavity, it delivers 4–4.5W with < 1kHz linewidth at the output of a single-mode fiber. The laser is tunable from about 700–1000nm; up to 8 W should be possible at 750–810nm.

8. We also tested removing the optical diode and the birefringent filter. We found, however, that this makes the laser exceedingly difficult to align and thus we achieve higher power with these elements in place.

9. CVI part No. PR1-850-90-0537; both the original and a tested 20% output coupler resulted in lower power.

11. It is important to limit the PZT volatge to below the maximum of 500V (using Z-diodes, for example).

12. Shorter than 1m, to avoid stimulated Brillouin scattering.

13. Increased pump power can increase the total power to a maximum of 7W, but also results in instable operation. Eventually, at more than 22W pump, the output power drops. We attribute this behavior to thermal lensing.

8. We also tested removing the optical diode and the birefringent filter. We found, however, that this makes the laser exceedingly difficult to align and thus we achieve higher power with these elements in place.

9. CVI part No. PR1-850-90-0537; both the original and a tested 20% output coupler resulted in lower power.

11. It is important to limit the PZT volatge to below the maximum of 500V (using Z-diodes, for example).

12. Shorter than 1m, to avoid stimulated Brillouin scattering.

13. Increased pump power can increase the total power to a maximum of 7W, but also results in instable operation. Eventually, at more than 22W pump, the output power drops. We attribute this behavior to thermal lensing.

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